/**
 * Internal dependencies
 */

import { normaliseFormats } from './normalise-formats';

/** @typedef {import('./types').RichTextValue} RichTextValue */

/**
 * Search a Rich Text value and replace the match(es) with `replacement`. This
 * is similar to `String.prototype.replace`.
 *
 * @param {RichTextValue}   value       The value to modify.
 * @param {RegExp|string}   pattern     A RegExp object or literal. Can also be
 *                                      a string. It is treated as a verbatim
 *                                      string and is not interpreted as a
 *                                      regular expression. Only the first
 *                                      occurrence will be replaced.
 * @param {Function|string} replacement The match or matches are replaced with
 *                                      the specified or the value returned by
 *                                      the specified function.
 *
 * @return {RichTextValue} A new value with replacements applied.
 */
export function replace({
  formats,
  replacements,
  text,
  start,
  end
}, pattern, replacement) {
  text = text.replace(pattern, (match, ...rest) => {
    const offset = rest[rest.length - 2];
    let newText = replacement;
    let newFormats;
    let newReplacements;
    if (typeof newText === 'function') {
      newText = replacement(match, ...rest);
    }
    if (typeof newText === 'object') {
      newFormats = newText.formats;
      newReplacements = newText.replacements;
      newText = newText.text;
    } else {
      newFormats = Array(newText.length);
      newReplacements = Array(newText.length);
      if (formats[offset]) {
        newFormats = newFormats.fill(formats[offset]);
      }
    }
    formats = formats.slice(0, offset).concat(newFormats, formats.slice(offset + match.length));
    replacements = replacements.slice(0, offset).concat(newReplacements, replacements.slice(offset + match.length));
    if (start) {
      start = end = offset + newText.length;
    }
    return newText;
  });
  return normaliseFormats({
    formats,
    replacements,
    text,
    start,
    end
  });
}
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